C# how to correctly dispose of an SmtpClient?

Question

VS 2010 code analysis reports the following:

Warning 4 CA2000 : Microsoft.Reliability : In method \'Mailer.SendMessage()\', object \'client\' is not disposed along

Answer 1

I would do something like that:

class Attachments : List, IDisposable
{
  public void Dispose()
  {
    foreach (Attachment a in this)
    {
      a.Dispose();
    }
  }
}

class Mailer : IDisposable
{
  SmtpClient client = new SmtpClient();
  Attachments attachments = new Attachments();

  public SendMessage()
  {
    [... do mail stuff ...]
  }

  public void Dispose()
  {
    this.client.Dispose();
    this.attachments.Dispose();
  }
}


[... somewhere else ...]
using (Mailer mailer = new Mailer())
{
  mailer.SendMail();
}

This would allow reusing the SmtpClient Object if you want to send multiple mails.